Katja Kassin (born 24 September 1979) is the stage name of a German pornstar. Katja Kassin was born in Leipzig, Germany. She was 10 years old when the Berlin Wall came down. She attended college and worked as a waitress prior to her porn career. She began nude modeling in Germany when she was 20 years old. She shot her first porn scene in Germany in May 2002. She contacted German adult actress, who invited her to travel to the United States. In March 2003, Kassin shot her first American sex scene in Straight to the A 4. In her first month working in the United States, she shot 25 scenes. In 2015, she appeared in the mainstream film as well.

Katja Kassin permanently moved to the Los Angeles area in late 2004 and married fellow American performer in January 2005. She divorced him in October 2006.